Aluminum-magnesium alloy and method of producing the same

Inactive Publication Date: 2013-09-12
KOREA AUTOMOTIVE TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0015]According to embodiments of the present invention, an aluminum (Al)-magnesium (Mg) alloy having a very good castability may be produced by preparing an Al—Mg master alloy having a high content of Mg and then diluting the Al—Mg master alloy without using a protective gas or using a small amount of the protective ga

Problems solved by technology

However, due to Mg having a chemically high oxidizing potential, an oxide or another inclusion may be mixed into molten Al during Mg is alloyed into the molten Al and thus the quality of molten metal may deteriorate.
If the amount of Mg added into molten Al is added, a problem due to oxidation of Mg becomes serious.
For example, if molten Al ha

Method used

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  • Aluminum-magnesium alloy and method of producing the same
  • Aluminum-magnesium alloy and method of producing the same
  • Aluminum-magnesium alloy and method of producing the same

Examples

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Example

[0059]In this case, the content of Mg in both of Example 1 and Comparative Example 1 is 10 wt %, and the content of Mg in the Al—Mg master alloy used in Example 1 is 38 wt %. Also, in both of Example 1 and Comparative Example 1, molten metal is continuous casted and then extruded to a form of a rod having a cross-sectional diameter of 180 mm.

[0060]Referring to FIGS. 4A and 4B, Example 1 shows a very good extruded material having no cracks or abnormal defects. On the other hand, Comparative Example 1 shows that serious damage is caused due to a plurality of casting cracks generated during extrusion.

[0061]As such, it is shown that, in comparison to the Al—Mg alloy prepared by using a conventional method, the Al—Mg alloy prepared according to the present invention has a very good processability in spite of a high content of Mg, for example, 10 wt %. Therefore, according to the present invention, an Al—Mg alloy having a high content of Mg, for example, 5 wt % or above, which was not sub...

Example

[0065]The Al—Mg alloy of Example 2 has remarkably superior mechanical properties to a commercial Al—Mg alloy. FIG. 5B shows tensile properties of the Al—Mg alloy of Example 2, and Table 1 shows mechanical properties of the Al—Mg alloy of Example 2 and an AC7A-F alloy that is a commercial Al—Mg casting alloy, according to the KS D 6008 standards.

TABLE 1Content of MgTensile Strength (MPa)Elongation (%)Example 210wt %23312AC7A-F3.5 to 5.5wt %21012

[0066]As shown in FIG. 5B and Table 1, the Al—Mg alloy of Example 2 has a superior tensile strength and an equivalent elongation to the AC7A-F alloy.

[0067]In the Al—Mg alloy prepared by using a conventional method, if Mg is increased to a high content, casting cracks are generated and thus a poor elongation is achieved. However, the Al—Mg alloy of Example 2 has a high content of Mg (10 wt %) more than double that of the AC7A-F alloy and has a superior tensile strength and an equivalently excellent elongation to the AC7A-F alloy.

[0068]Consideri...

Example

[0070]Referring to FIG. 6 and Table 2, the extruded material of Example 3 has remarkably superior mechanical properties to the extruded material of the 5052 alloy. That is, the extruded material of Example 3 has a greatly higher tensile strength and a quite higher elongation than the extruded material of the 5052 alloy.

[0071]As described above, since processability is greatly reduced if the content of Mg in an Al—Mg alloy is high, a 5000-series alloy that is a commercial Al—Mg alloy for preparing a processed material is designed to have a content of Mg less than 5.5 wt %. However, the extruded material of Example 3 in which the content of Mg is 10 wt % has remarkably superior elongation and strength properties to the extruded material of the 5052 alloy in which the content of Mg is 2.2 to 2.8 wt %.

[0072]FIG. 7 is an optical microscopic image of a microstructure of the extruded material of Example 3. As shown in FIG. 7, the extruded material of Example 3 has a microstructure in which...

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Abstract

Provided are an extruded aluminum (Al)-magnesium (Mg) material and a method of producing the same. An Al—Mg master alloy having a first Mg content is provided. An Al—Mg alloy having a second Mg content less than the first Mg content is prepared by adding the Al—Mg master alloy into molten Al and then casting the molten Al. An extruded Al—Mg material is prepared by extruding the Al—Mg alloy.

Description

TECHNICAL FIELD[0001]The present invention relates to a technology of producing an aluminum (Al) alloy, and more particularly, to an Al-magnesium (Mg) alloy prepared by adding Mg as an alloying element, and a method of producing the same.BACKGROUND ART[0002]Currently, magnesium (Mg) is regarded as one of main alloying elements in an aluminum (Al) alloy. Addition of Mg allows an Al alloy to have a high strength, to be favorable to surface treatment, and to have improved corrosion resistance. As shown in FIG. 1, Mg may be soluble in Al to about 17.4 weight percent (wt %) at about 450° C.[0003]However, due to Mg having a chemically high oxidizing potential, an oxide or another inclusion may be mixed into molten Al during Mg is alloyed into the molten Al and thus the quality of molten metal may deteriorate. If the amount of Mg added into molten Al is added, a problem due to oxidation of Mg becomes serious. The deterioration in quality of molten metal may greatly influence properties of ...

Claims

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Application Information

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IPC IPC(8): C22C21/06C22C23/02B22D25/00
CPCB22D21/007C22C1/03C22C23/02B22D25/00C22C21/06
Inventor SUNG, SI YOUNGHAN, BEOM SUCK
Owner KOREA AUTOMOTIVE TECH INST
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